Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery

Abstract Electrochemical stability of energy storage devices is one of their major concerns. Polymeric binders are generally used to enhance the stability of the electrode, but the electrochemical performance of the device is compromised due to the poor conductivity of the binders. Herein, 3D binder...

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Autores principales:	Elochukwu Stephen Agudosi, Ezzat Chan Abdullah, Arshid Numan, Nabisab Mujawar Mubarak, Siti Rahmah Aid, Raúl Benages-Vilau, Pedro Gómez-Romero, Mohammad Khalid, Nurizan Omar
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f69c897993ed4425aa380179bdbe4276
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spelling	oai:doaj.org-article:f69c897993ed4425aa380179bdbe42762021-12-02T15:39:39ZFabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery10.1038/s41598-020-68067-22045-2322https://doaj.org/article/f69c897993ed4425aa380179bdbe42762020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-68067-2https://doaj.org/toc/2045-2322Abstract Electrochemical stability of energy storage devices is one of their major concerns. Polymeric binders are generally used to enhance the stability of the electrode, but the electrochemical performance of the device is compromised due to the poor conductivity of the binders. Herein, 3D binder-free electrode based on nickel oxide deposited on graphene (G-NiO) was fabricated by a simple two-step method. First, graphene was deposited on nickel foam via atmospheric pressure chemical vapour deposition followed by electrodeposition of NiO. The structural and morphological analyses of the fabricated G-NiO electrode were conducted through Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS). XRD and Raman results confirmed the successful growth of high-quality graphene on nickel foam. FESEM images revealed the sheet and urchin-like morphology of the graphene and NiO, respectively. The electrochemical performance of the fabricated electrode was evaluated through cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) in aqueous solution at room temperature. The G-NiO binder-free electrode exhibited a specific capacity of ≈ 243 C g−1 at 3 mV s−1 in a three-electrode cell. A two-electrode configuration of G-NiO//activated charcoal was fabricated to form a hybrid device (supercapattery) that operated in a stable potential window of 1.4 V. The energy density and power density of the asymmetric device measured at a current density of 0.2 A g−1 were estimated to be 47.3 W h kg−1 and 140 W kg−1, respectively. Additionally, the fabricated supercapattery showed high cyclic stability with 98.7% retention of specific capacity after 5,000 cycles. Thus, the proposed fabrication technique is highly suitable for large scale production of highly stable and binder-free electrodes for electrochemical energy storage devices.Elochukwu Stephen AgudosiEzzat Chan AbdullahArshid NumanNabisab Mujawar MubarakSiti Rahmah AidRaúl Benages-VilauPedro Gómez-RomeroMohammad KhalidNurizan OmarNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-13 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Elochukwu Stephen Agudosi Ezzat Chan Abdullah Arshid Numan Nabisab Mujawar Mubarak Siti Rahmah Aid Raúl Benages-Vilau Pedro Gómez-Romero Mohammad Khalid Nurizan Omar Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery
description	Abstract Electrochemical stability of energy storage devices is one of their major concerns. Polymeric binders are generally used to enhance the stability of the electrode, but the electrochemical performance of the device is compromised due to the poor conductivity of the binders. Herein, 3D binder-free electrode based on nickel oxide deposited on graphene (G-NiO) was fabricated by a simple two-step method. First, graphene was deposited on nickel foam via atmospheric pressure chemical vapour deposition followed by electrodeposition of NiO. The structural and morphological analyses of the fabricated G-NiO electrode were conducted through Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS). XRD and Raman results confirmed the successful growth of high-quality graphene on nickel foam. FESEM images revealed the sheet and urchin-like morphology of the graphene and NiO, respectively. The electrochemical performance of the fabricated electrode was evaluated through cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) in aqueous solution at room temperature. The G-NiO binder-free electrode exhibited a specific capacity of ≈ 243 C g−1 at 3 mV s−1 in a three-electrode cell. A two-electrode configuration of G-NiO//activated charcoal was fabricated to form a hybrid device (supercapattery) that operated in a stable potential window of 1.4 V. The energy density and power density of the asymmetric device measured at a current density of 0.2 A g−1 were estimated to be 47.3 W h kg−1 and 140 W kg−1, respectively. Additionally, the fabricated supercapattery showed high cyclic stability with 98.7% retention of specific capacity after 5,000 cycles. Thus, the proposed fabrication technique is highly suitable for large scale production of highly stable and binder-free electrodes for electrochemical energy storage devices.
format	article
author	Elochukwu Stephen Agudosi Ezzat Chan Abdullah Arshid Numan Nabisab Mujawar Mubarak Siti Rahmah Aid Raúl Benages-Vilau Pedro Gómez-Romero Mohammad Khalid Nurizan Omar
author_facet	Elochukwu Stephen Agudosi Ezzat Chan Abdullah Arshid Numan Nabisab Mujawar Mubarak Siti Rahmah Aid Raúl Benages-Vilau Pedro Gómez-Romero Mohammad Khalid Nurizan Omar
author_sort	Elochukwu Stephen Agudosi
title	Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery
title_short	Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery
title_full	Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery
title_fullStr	Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery
title_full_unstemmed	Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery
title_sort	fabrication of 3d binder-free graphene nio electrode for highly stable supercapattery
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/f69c897993ed4425aa380179bdbe4276
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Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery

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